Graver tool



FIG. 1 is a first perspective view of a graver tool embodying the design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines showing the remainder of the graver tool are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a graver tool, as shown and described. 